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Similar control mechanisms regulate the insulin and type I insulin-like growth factor receptor kinases. Affinity-purified insulin-like growth factor I receptor kinase is activated by tyrosine phosphorylation of its beta subunit

Similar control mechanisms regulate the insulin and type I insulin-like growth factor receptor kinases. Affinity-purified insulin-like growth factor I receptor kinase is activated by tyrosine phosphorylation of its beta subunit

Journal of Biological Chemistry 261(24): 11341-11349

ISSN/ISBN: 0021-9258

PMID: 3015966

Insulin-like growth factor I (IGF-I) receptors are partially prufied from human placenta by sequential affinity chromatography with wheat germ agglutinin-agarose and agarose derivatived with an IGF-I analog. Adsorption specificity to this affinity matrix demonstrates that low coupling ratios of IGF-I analog to agarose yield preparations that are highly selective in purifying IGF-I receptor with minimal cross-contamination by the insulin receptor present in the same placental extracts. Incubation of the immobilized IGF-I receptor preparation with [.gamma.-32P]ATP results in a marked phosphorylaton of the receptor .beta. subunits, which appear as a doublet of Mr = 93,000 and 95,000 upon electrophoresis on dodecyl sulfate-polyacrylamide gels. The 32P-labeled receptor .beta. subunit doublet contains predominantly phosphotyrosine and to a much lesser extent phosphoserine and phosphothreonine residues. The immobilized IGF-I receptor preparation exhibits tyrosine kinase activity toward exogenous histone. The characteristics of the IGF-I receptor-associated tyrosine kinase are remarkably similar to those of the insulin receptor kinase. Thus, prior phosphorylation of the immobilized IGF-I receptor preparation with increasing concentrations of unlabeled ATP followed by washing to remove the unreacted ATP results in a progressive activation of the receptor-associated histone kinase activity. A maximal (10-fold) activation is achieved between 0.25 and 1 mM ATP. The concentration of ATP required for half-maximal (30 .mu.M) activation of the IGF-I receptor kinase is similar to that of the insulin receptor kinase. Like the insulin receptor kinase, the elevated kinase activity of the phosphorylated IGF-I receptor is reversed following dephosphorylation of the receptor .beta. subunit with alkaline phosphatase. Furthermore, the phosphorylation of the IGF-I receptor .beta. subunit doublet is enhanced by 7-8-fold when reductant is included in the reaction medium, as is observed for the insulin receptor kinase. Significantly, the dose responses of both receptor types to reductant are identical. Both of the 32P-labeled IGF-I receptor .beta. subunit bands are resolved into six matching phosphopeptide fractions when the corresponding tryptic hydrolysates are resolved by reverse phase high pressure liquid chromatography. Significantly, four out of the six phosphopeptide fractions derived from the trypsinized IGF-I reeceptor .beta. subunits are chromatographically identical to those from the tryptic hydrolysates of 32P-labeled insulin receptor .beta. subunit. These results suggest that the IGF-I receptor-associated and insulin receptor tryosine kinases share common enzymatic and structural features.

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Accession: 006416311

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